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What is Mitosis? • Mitosis: Cell division involving somatic (nonsex) cells • Involves only diploid cells • Form of asexual reproduction for some life (bacteria & protista, fungi) • End Result: Two genetically identical “daughter cells” The Cell Cycle • Defined: Repeating set of events in the life of a cell • 1) Interphase – G1, S, G2 • • • • 2) Prophase 3) Metaphase 4) Anaphase 5) Telophase Interphase • Divided into 3 Stages: • G1 Stage – Normal function performed – Cell growth – Organelles created • S Stage – Chromatin (DNA strands) duplicated • G2 Stage – Cell growth – Normal function performed Prophase • 1st Mitosis Stage • Chromatin (DNA strands) coils into chromosomes • Nucleus dissolves spilling the chromosomes • Spindle fibers form Metaphase • 2nd stage of mitosis • Spindle fibers attach to centromeres of each chromosome • Spindle fibers pull the chromosomes to the cell’s equator Anaphase • 3rd stage of mitosis • Spindle fibers pull ½ the chromatids to each end of the cell – Humans: 46 chromatids each way Telophase • 4th stage of mitosis • Spindle fibers dissolve • Chromatids unwind into chromatin • Nucleus reforms • Cytokinesis: division of the cytoplasm Name that Stage! Name that Stage! Name that Stage! Name that Stage! Name that Stage! Quick Review • Mitosis = the division of somatic (nonsex) cells • Each stage has different characteristics • End Result = Two identical diploid cells